The Model 72A experienced some re-developed components, notably a sound lifter; the former a person was split. Model 72s had no pull-excess weight adjustment screw as is discovered on the 69As. Along with the Substantial Wall version, constructed for the greater powerful cartridges, just the top in the breech block https://highimpactrounds.com/product/winchester-super-x-12ga-2-75in-1oz-6-lead-shot-1290fps-25-rd-bx/